Cargo ship hits bridge in Baltimore, causing collapse. Here's what we know so far

A major span critical to East Coast shipping collapsed early Tuesday morning after it was struck by a large cargo ship, prompting a massive emergency response for at least seven people in the water.

Here is what we know so far:

What Cargo ship hit Baltimore bridge?

The cargo ship Dali struck the Key bridge around 1:40 a.m. Tuesday after experiencing electrical problems, officials said.

The 984-foot ship sailing under the flag of Singapore was slated to arrive early next month in Sri Lanka, according to MarineTraffic, a global ship tracking service.

What bridge collapsed in Baltimore?

The Francis Scott Key Bridge in Baltimore was the bridge that collapsed. Several vehicles were on the bridge at the time of impact and were plunged into the Patapsco River.

The four-lane structure carries roughly 11.3 million vehicles per year, according to the Maryland Transportation Authority.

Where is the Baltimore bridge?

The span is the outermost of three tolls that connects the Baltimore Beltway in the city and sits Interstate 895 and the Baltimore Harbor Tunnel.

The bridge has access to Sparrows Point, a port that houses distribution centers for Amazon, Home Depot, FedEx, major vehicle brands and other retailers.

What river is the Baltimore bridge over?

The Francis Scott Key bridge is located in the Baltimore harbor and spans the Patapsco River.

Are there any survivors from Baltimore bridge collapse?

Six people remain unaccounted at the site of the bridge collapse, Coast Guard officials said.

The U.S. Coast Guard said Tuesday evening it was calling off the search-and-rescue mission for the six construction workers that went missing.

Two people were rescued. One was unharmed and the other remains in "very serious condition," Maryland Transportation Secretary Paul Wiedefeld said.

How many cars were on the bridge when it collapsed?

Several vehicles were on the bridge at the time of impact and plunged into the river. There were multiple contractors on the bridge who were repairing potholes, Wiedefeld said.

How long is the Francis Scott Key bridge?

The Francis Scott Key Bridge is roughly 1.6 miles long. Including the bridge and approach roadways, the facility is approximately 10.9 miles in length, according to maryland.gov.

When was the Francis Scott Key bridge built?

The outer crossing of the Baltimore Harbor opened in March 1977 as the final link in I-695, according to maryland.gov.

Construction started in 1972 and costed about $60.3 million to build.

Key bridge collapse: Aerial images, video show aftermath of Baltimore bridge collapse

Baltimore bridge collapse: Key Bridge collapses after ship collision; 2 rescued, search continues

Who was Francis Scott Key?

Francis Scott Key was a lawyer, author and amateur poet from Frederick, Maryland, who wrote the national anthem. The bridge is named after Key since he was inspired to write the words of the "Star Spangled Banner" where it spans the Patapsco River.

Scholars believe the span crosses within 100 yards of the site where Key witnessed the bombardment of Fort McHenry on the evening of Sept. 12, 1814, according to maryland.gov.

Charles Ventura, Theo Nguyn, Susan Miller and Christopher Cann contributed to this story.

This article originally appeared on Delaware News Journal: Cargo ship hits bridge in Baltimore. What bridge collapsed and where